EMS98 intensities distribution of the “Le Teil” earthquake, France, 11 November 2019 (Mw 4.9) based on macroseismic surveys and field investigations

Schlupp, Antoine; Sira, Christophe; Provost, Ludmila; Dretzen, Rémi; Bertrand, Éric; Beck, Elise; Schaming, Marc

doi:10.5802/crgeos.88

Cited by 9 publications

(8 citation statements)

References 36 publications

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“…Strong ground motion and severe damage were observed in the villages located in the vicinity of the rupture zone (Ritz et al 2020;Causse et al 2021;Cornou et al 2021). Schlupp et al (2021) estimated, on the basis of field observations and communal surveys, a maximum intensity (EMS98) of about VII-VIII in Le Teil and at least VI in 30 nearby localities. This recent earthquake further highlights the importance of conducting seismic hazard studies in the area.…”

Section: Context Of the Studymentioning

confidence: 99%

Insights into the conditions of application of noise-based spectral ratios in a highly industrialized area: a case study in the French Rhone Valley

Gisselbrecht

Froment

Boué

et al. 2023

Geophysical Journal International

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Summary The local ground motion amplification related to the geology at a specific site (i.e. the so-called site effects) may be classically quantified through the SSR (Standard Spectral Ratio) technique applied on earthquake recordings. However, such a quantification might be challenging to carry out in low-to-moderate seismicity regions. Methods based on background ambient noise, such as noise-based Standard Spectral Ratio (SSRn), might be of great interest in these areas. But noise-derived amplification is particularly sensitive to local anthropogenic sources, which may introduce biases in the evaluation of site effects by dominating the geological effects, especially for frequencies higher than 1 Hz. A hybrid approach (SSRh), developed to reduce biases in noise-based spectral ratios by combining classical earthquake-based spectral ratio (SSR) and SSRn, was recently introduced and relies on a site-reference. We here investigate the applicability of SSRn and SSRh in a heavily industrialized environment in the Tricastin Valley (South-East France), where critical facilities are located. We continuously recorded ambient noise from February to March 2020 on a 400-sensor seismic array covering an area of about 10 km by 10 km. We demonstrate that SSRn and SSRh computed below 1 Hz are able to reproduce amplification factors provided by SSR. By contrast, at frequencies higher than 1 Hz, SSRn strongly deviates from SSR. SSRh shows closer results to SSR but presents a dependence to the choice of the local site-reference, thereby questioning the possibility to use SSRh blindly to estimate the local amplification in our context. These discrepancies reflect the impact of local anthropogenic sources. We therefore introduced a two-step workflow to mitigate the influence of local sources. The first step is to define a characteristic time window to optimally isolate significant transient signals. The second step consists in selecting the time segments that do not contain these transients with a clustering-based approach. By applying this workflow, we were able to remove some strong anthropogenic transient signals likely to be generated by local sources at some sites and therefore to locally improve the amplification assessment through noise-based spectral ratios. However, stationary sources, whose impact cannot be removed through our procedure, remain a major issue. This study provides some insights into the application of SSRn and SSRh in noisy industrialized areas, especially regarding the impact of local noise sources. It illustrates the difficulty of having a procedure for mitigating the impact of these sources that is efficient everywhere inside such a complex anthropized environment, where different types of sources (including stationary sources) cohabit.

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Section: Context Of the Studymentioning

confidence: 99%

Insights into the conditions of application of noise-based spectral ratios in a highly industrialized area: a case study in the French Rhone Valley

Gisselbrecht

Froment

Boué

et al. 2023

Geophysical Journal International

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“…For Le Teil in particular, the ESHM20 estimates a mean Peak Ground Acceleration (PGA) of 0.04 g with a 0.21 % probability of exceedance in 1 year (475 years mean return period) on rock site conditions (Vs,30 = 800 m/s). A private power plant accelerometer, located 15 km north-northeast of the epicentre, recorded PGA of 0.045 g (Schlupp et al, 2022), as the closest seismic station to the earthquake. Three stations of the French seismological and geodetic network (Résif / EPOS-FR) at 24-44 km from the epicentre recorded PGAs in the range of 0.004-0.007 g. These four stations are at such a distance from the epicentre and the municipality of Le Teil, so that they cannot accurately constrain the predicted IMs.…”

Section: Seismic Hazard and Risk And Information For 2019 Le Teil Ear...mentioning

confidence: 99%

“…Moreover, they suggested that existing ground motion models may not be useful in the case of earthquakes such as this one, with a rarely observed shallow hypocentral depth, and with rupture parameters such as stress drop that are usually associated with earthquakes not only at larger depths, but of larger magnitudes too. Schlupp et al (2022) reported an EMS98 macroseismic intensity of 7-8 for the municipality of Le Teil. This conclusion was the product of expert judgement considering the EMS98 definitions of the intensity degrees and damage grades, the field observations from the Macroseismic Response Group, and the EMS98 Vulnerability Classes of the buildings based on land registration data.…”

Section: Seismic Hazard and Risk And Information For 2019 Le Teil Ear...mentioning

confidence: 99%

“…This conclusion was the product of expert judgement considering the EMS98 definitions of the intensity degrees and damage grades, the field observations from the Macroseismic Response Group, and the EMS98 Vulnerability Classes of the buildings based on land registration data. Based on this procedure, Schlupp et al (2022) determined 765 macroseismic intensities covering the area affected by the earthquake. The isoseist line of the map by Schlupp et al (2022) for intensity VII includes the built area of the Le Teil: given the limited spatial extent of this area, there is practically no spatial variation of the macroseismic intensity within this isoseist line, and the maximum is at the Le Teil (7.5).…”

Section: Seismic Hazard and Risk And Information For 2019 Le Teil Ear...mentioning

confidence: 99%

“…Based on this procedure, Schlupp et al (2022) determined 765 macroseismic intensities covering the area affected by the earthquake. The isoseist line of the map by Schlupp et al (2022) for intensity VII includes the built area of the Le Teil: given the limited spatial extent of this area, there is practically no spatial variation of the macroseismic intensity within this isoseist line, and the maximum is at the Le Teil (7.5).…”

Section: Seismic Hazard and Risk And Information For 2019 Le Teil Ear...mentioning

confidence: 99%

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Testing the 2020 European Seismic Hazard and Risk Models using data from the 2019 Le Teil (France) earthquake

Trevlopoulos¹,

Gehl²,

Negulescu³

et al. 2023

Preprint

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Abstract. Probabilistic seismic hazard and risk models are essential to improving our awareness of seismic risk, to its management, and to increasing our resilience against earthquake disasters. These models consist of a series of components, which may be tested and validated individually, however testing and validating these types of models as a whole is challenging due to the lack of recognised procedures. Estimations made with other models, as well as observations of ground shaking and damages in past earthquakes lend themselves to testing the components for ground motion modelling and for the severity of damage to buildings. Here, we are using observations of damages caused by the Le Teil 2019 earthquake, third-party estimations of macroseismic intensity for this seismic event, and ShakeMap analyses in order to conduct tests on estimations made with scenario simulations using components of the 2020 Euro-Mediterranean Seismic Hazard Model and the European Seismic Risk Model. The tests concern the number of damaged buildings, the grade of damage, estimated ground motion intensity measures, and macroseismic intensity. In some scenarios, the models forecast shaking and damage consistent with the observations, while major divergences from observations are attributed to factors external to the tested models, such as the location of the hypocentre.

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Regional physics-based simulation of ground motion within the Rhȏne Valley, France, during the MW 4.9 2019 Le Teil earthquake

Smerzini

Vanini

Paolucci

et al. 2022

Bull Earthquake Eng

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In this paper, a comprehensive validation exercise of 3D physics-based numerical simulations (PBS) of seismic wave propagation is presented for a low-to-moderate seismicity area in the south east of France, within the Rhône River Valley, that hosts several operating nuclear installations. This area was hit on Nov 11, 2019, by an unusually damaging Mw 4.9 earthquake (Le Teil event). The numerical code SPEED ( http://speed.mox.polimi.it/ ), developed at Politecnico di Milano, Italy, was used to validate the simulations against the available recordings. When comparing simulations with records, a good to excellent agreement was found up to 8-10 Hz, showing that, even without a very detailed 3D numerical model of the medium, the PBS may provide realistic broadband predictions of earthquake ground motion. This also demonstrates that PBS, if suitably calibrated and validated, may be either an alternative or a useful complement to empirical ground motion models. Referring to the seismic risk evaluation of strategic and critical structures, infrastructures and industrial plants, such as nuclear power plants, the failure of which during an earthquake may endanger safety of population and cause environmental disasters, the 3D PBS may throw light on region-and site-specific features of ground shaking, especially in near-source conditions, that are typically poorly constrained in empirical models.

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EMS98 intensities distribution of the “Le Teil” earthquake, France, 11 November 2019 (Mw 4.9) based on macroseismic surveys and field investigations

Cited by 9 publications

References 36 publications

Insights into the conditions of application of noise-based spectral ratios in a highly industrialized area: a case study in the French Rhone Valley

Insights into the conditions of application of noise-based spectral ratios in a highly industrialized area: a case study in the French Rhone Valley

Testing the 2020 European Seismic Hazard and Risk Models using data from the 2019 Le Teil (France) earthquake

Regional physics-based simulation of ground motion within the Rhȏne Valley, France, during the MW 4.9 2019 Le Teil earthquake

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